bc518174
 王天杨
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import type {
FirstWeekContainsDateOptions,
LocalizedOptions,
WeekOptions,
} from "./types.js";
/**
* The {@link getWeekYear} function options.
*/
export interface GetWeekYearOptions
extends LocalizedOptions<"options">,
WeekOptions,
FirstWeekContainsDateOptions {}
/**
* @name getWeekYear
* @category Week-Numbering Year Helpers
* @summary Get the local week-numbering year of the given date.
*
* @description
* Get the local week-numbering year of the given date.
* The exact calculation depends on the values of
* `options.weekStartsOn` (which is the index of the first day of the week)
* and `options.firstWeekContainsDate` (which is the day of January, which is always in
* the first week of the week-numbering year)
*
* Week numbering: https://en.wikipedia.org/wiki/Week#The_ISO_week_date_system
*
* @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
*
* @param date - The given date
* @param options - An object with options.
*
* @returns The local week-numbering year
*
* @example
* // Which week numbering year is 26 December 2004 with the default settings?
* const result = getWeekYear(new Date(2004, 11, 26))
* //=> 2005
*
* @example
* // Which week numbering year is 26 December 2004 if week starts on Saturday?
* const result = getWeekYear(new Date(2004, 11, 26), { weekStartsOn: 6 })
* //=> 2004
*
* @example
* // Which week numbering year is 26 December 2004 if the first week contains 4 January?
* const result = getWeekYear(new Date(2004, 11, 26), { firstWeekContainsDate: 4 })
* //=> 2004
*/
export declare function getWeekYear<DateType extends Date>(
date: DateType | number | string,
options?: GetWeekYearOptions,
): number;
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